Guyanancistrus nassauensis Mol, Fisch-Muller & Covain, 2018

Family:  Loricariidae (Armored catfishes), subfamily: Hypostominae
Max. size:  6.1 cm SL (male/unsexed)
Environment:  demersal; freshwater
Distribution:  South America: Paramaka Creek and some of its tributaries, Marowijne River Basin in the Surinamese Nassau Mountains.
Diagnosis:  Dorsal spines (total): 2-2; Dorsal soft rays (total): 7-7; Anal soft rays: 5-5. Description: pelvic fin i,5; anal fin i,4 (except 1 specimen, 49.6 mm SL, with i,5) (Ref. 116863).
Biology:  The type locality, Paramaka Creek, is a medium sized and shallow stream with 3-7 m width, less than 50 cm depth, pools and some riffle habitat, a rocky substrate, and bordered by terra firme rainforest. Its water was transparent with a mean pH of 6.26, conductivity 24.2 μS/cm and temperature 23.2°C. Collected together with several Harttiella crassicauda (Ref. 116863).
IUCN Red List Status: Endangered (EN); Date assessed: 21 October 2020 (B1ab(iii)+2ab(iii)) Ref. (130435)
Threat to humans:  harmless


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